User-visible changes in simple 2.2.0:
	The lexer has been substantially altered: builtins such as
<cartype_escape_next> replace the former <change_escape_next_char> and
similar.  A bug has been corrected (EOF not being caught when scanning
quotes: thus, a file containing simply a less sign and an open bracket
would cause simple to spin in an endless loop while allocating more
and more memory.)

User-visible changes in simple 2.1.2:
	Several new builtins have been added, namely <translation>
(used to translate one token to another), <find> (find a token string
in another one and report its position), <substr> (return a substring
of a token string), <defof> (return the definition of a user-defined
macro without actually performing parameter expansion as in a call)
and <qdefof> (same thing, but quoted).
